fix: govc fix field.info name (-n flag) validation

linter: check `cerr != nil` but return a nil value error `err`

Signed-off-by: alingse <alingse@foxmail.com>

uddate test case

Author: alingse

cli/fields/info.go

@@ -134,7 +134,7 @@ func (cmd *info) Run(ctx context.Context, f *flag.FlagSet) error {
 	if cmd.name != "" {
 		fkey, cerr := m.FindKey(ctx, cmd.name)
 		if cerr != nil {
-			return err
+			return cerr
 		}
 		matches = func(key int32) bool {
 			return key == fkey

govc/test/fields.bats

@@ -35,7 +35,10 @@ load test_helper
   run govc fields.info vm/$vm_id
   assert_success
 
-  run govc fields.info -n $val vm/$vm_id
+  run govc fields.info -n "invalid" vm/$vm_id
+  assert_failure
+
+  run govc fields.info -n $field vm/$vm_id
   assert_success
 
   info=$(govc vm.info -json $vm_id | jq .virtualMachines[0].customValue[0])